CVE-2019-1977
MEDIUMEPSS 72th pctlDescription
A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploit Intelligence
Elevated risk: more likely to be exploited than 72% of all known CVEs.
References
Related Vulnerabilities
Other CWE-371 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-3574 | High | 7.5 | 8.0% | - | Fix |
| CVE-2018-0282 | Medium | 6.8 | 2.0% | - | - |
| CVE-2020-3200 | High | 7.7 | 1.7% | - | - |
| CVE-2020-3422 | High | 7.5 | 1.3% | - | - |
| CVE-2024-20455 | High | 8.6 | 0.7% | - | - |
| CVE-2020-3385 | Medium | 6.5 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2019-1977?
No published fix for CVE-2019-1977 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2019-1977 being actively exploited?
Not that we know of. CVE-2019-1977 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 72% of all scored CVEs.
How severe is CVE-2019-1977?
CVE-2019-1977 has a CVSS v3 base score of 6.8, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.